Pentrado

▶ Try it in your browser: pentrado.com — no install, your document persists locally.

A layered raster/vector image editor for the web — the class of tool occupied by GIMP, Photoshop and Photopea, built as an embeddable library. Pentrado is developed alongside ComfyTV (where it powers the Layer Editor and Storyboard stages) but has no dependency on ComfyUI or ComfyTV: everything the editor needs from its surroundings goes through the PentradoHost interface.

Installation

npm i pentrado

Two entry points:

import { useLayerEditorStage, LayerEditorCanvas, messages } from 'pentrado'
import 'pentrado/style.css'

The full surface — Vue 3 components, composables, host contract, PSD import/export, filters, locales. Requires the vue, vue-i18n and reka-ui peers (and ag-psd if you use PSD import/export).

import { walk, findNode, renderDocument } from 'pentrado/engine'

The pure-TypeScript core — document model, commands, history, tools, painting, compositor. No framework peers needed; importable without vue installed.

Layout

• src/engine/ — pure TypeScript core: scene-graph document model (raster / text / vector / adjustment / fill / group nodes, masks), command-based undo history, selection model, tools, painting, WebGL compositor with full blend mode set, non-destructive layer fx, PSD-grade adjustment math.
• src/ui/ — Vue 3 components and composables: canvas viewport, tool bar and tool strip, layer panel, text editing popup, hotkeys.
• src/primitives/ — self-contained form controls used by the UI (select, slider with gradient track, curves editor).
• src/host.ts — the embedding contract. Uploads, downloads, notifications, i18n, font resources, media-library export and asset picking are all provided by the host. Every hook is optional; built-in fallbacks (object-URL uploads, English strings, plain file drop) keep the editor fully functional standalone.
• src/locales/ — UI strings (pentrado.* namespace) for en/zh, exported for merging into a host vue-i18n instance.
• PSD import/export (psdImport.ts / psdExport.ts), text shaping via a vendored Typr (vendor/typr), font store, filters, pan/zoom.

Embedding sketch

import {
  useLayerEditorStage, providePentradoHost,
  LayerEditorCanvas, LayerEditorToolBar, LayerListPanel,
  type PentradoHost, type LayerEditorStorage,
} from 'pentrado'

const host: PentradoHost = { uploadBlob, notify, t, /* … */ }
const storage: LayerEditorStorage = { /* persist document JSON somewhere */ }

providePentradoHost(host)
const editor = useLayerEditorStage({ storage, host })
// render <LayerEditorCanvas :editor="editor" /> etc.

The i18n contract: templates use $t('pentrado.…'), so the host app installs vue-i18n and merges messages from pentrado.

Repository layout & workflow

This repo is the source of truth for Pentrado. src/ is the engine + UI (with its tests), site/ is pentrado.com (the standalone editor with IndexedDB persistence).

• npm run dev — local editor at the vite dev URL
• npm test / npm run typecheck — engine + UI suites
• npm run build — build the npm package to dist/
• npm run build:site / npm run deploy — build dist-site/ and publish to Cloudflare Pages (production)

ComfyTV consumes a synced copy: in the ComfyTV repo, npm run pentrado:sync mirrors this repo's src/ into packages/pentrado/src, then run ComfyTV's own typecheck/tests/build to confirm nothing downstream broke.